A Litten might be a good choice for Serena. It has a fiery personality and could bring a new dynamic to her team. With proper training, it could become a powerful Fire - type Pokemon in battles against water - type opponents in Alola.
Sure. 'Ash's Alola Pokemon Team' is a fanfic that centers around exactly that. It shows how Ash assembled his team in Alola, the training they went through together, and their unique bonds. Another one is 'The Alola - bound Pokemon of Ash' which gives insights into the individual personalities of his Alola Pokemon and how they work together as a team.
One great Pokemon Amourshipping Alola fanfic could be 'A New Adventure in Alola'. It might explore the relationship between the characters in the context of the beautiful Alola region, with new Pokemon encounters and adventures that enhance the Amourshipping aspect.
Since it's a fanfiction about Pokemon in the Alola region, it could involve the main character exploring different islands. They might take part in the island challenges, meet unique Alola Pokemon forms, and have interactions with the local characters. For example, they could team up with Hau or Lillie to battle Team Skull or discover some hidden secrets in the Alola region's beautiful landscapes.
Well, in 'pokemon dawn alola fanfiction', the themes of exploration and new beginnings are often seen. Dawn is essentially starting a new chapter of her Pokemon journey in Alola. She gets to explore the beautiful islands, meet new characters, and encounter Pokemon she's never seen before. This sense of the unknown and the excitement that comes with it is a big part of these fanfictions. Also, the theme of cultural exchange is present, as she experiences the unique Alolan culture which is different from what she's used to in other regions.
There are also fanfictions where Ash catches Rayquaza. This could be set during a time when the sky is in chaos due to some dark energy. Rayquaza is drawn to Ash because of his pure heart and determination. Ash, with his usual courage, teams up with his pokemon to assist Rayquaza in restoring balance. As a result, Rayquaza allows Ash to catch it.
You can try looking on some fanfic websites like FanFiction.net or Archive of Our Own. They have a large collection of Pokemon fanfics, and there's a chance you might find 'pokemon alola lemon fanfic' there.
In the Pokemon Alola Ultra Adventures fanfic regarding Greninja, it may start with Greninja arriving in Alola. It could then get into battles with the island Kahunas' Pokemon. Since Greninja is a very powerful Pokemon, it might be a key figure in some important events in Alola. For example, it could help protect the Alola region from some kind of threat that is not common in other regions. And it may also have some interactions with the Alolan forms of known Pokemon, which would be really interesting to read about.
One possible plot idea could be Serena starting a new Pokemon journey in Alola. She might encounter unique Alola Pokemon and have to adapt to the new region's battle styles. For example, she could participate in the Alola trials and learn about the local culture and traditions related to Pokemon.
I don't know for sure without reading it, but probably the trainer who is on the Alola journey, and maybe some of the well - known Alola characters like Hau or Lillie.